#fdj {
    position: relative;
    width: 450px;
    height: 450px;
}
#fdj img{
    width: 450px;
    height: 450px;
}
#fdj .mengban {
    position: absolute;
    display: none;
    width: 225px;
    height: 225px;
    background-color: yellow;
    opacity: 0.4;
    cursor: move;
    left: 0;
    top: 0;
}
#fdj .fdjBox {
    position: absolute;
    width: 450px;
    height: 450px;
    top: 0;
    left: 460px;
    display: none;
}